Compton tails in long-duration gamma-ray bursts

Barbiellini, G.; Celotti, A.; Ghirlanda, G.; Longo, F.; Piro, L.; Tavani, M.

doi:10.1111/j.1365-2966.2004.07787.x

Cited by 7 publications

(8 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Possibility (ii) postulates the existence of some scattering material along the line of sight, following the original idea of Brainerd (1994) and Brainerd et al (1998), and later used also by Barbiellini et al (2004). In this case we are receiving the transmitted flux piercing through the scattering screen.…”

Section: Introductionmentioning

confidence: 99%

Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

Ghisellini

Ghirlanda

Mereghetti

et al. 2006

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy E_iso emitted in the prompt radiation phase and the peak frequency E_peak of the spectrum in a vF(v) representation (the so-called Amati relation). We discuss if these two bursts are really different from the others or if their location in the E_iso-E_peak plane is the result of other effects, such as viewing them off-axis, or through a scattering screen, or a misinterpretation of their spectral properties. The latter case seems particularly interesting after GRB 060218, that, unlike GRB 031203 and GRB 980425, had a prompt emission detected both in hard and soft X-rays which lasted ~2800 seconds. This allowed to determine its E_peak and total emitted energy. Although it shares with GRB 031203 the total energetics, it is not an outlier with respect to the Amati correlation. We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation.Comment: 13 pages, 9 figures, 2 tables. Accepted for publication in MNRA

show abstract

Section: Introductionmentioning

confidence: 99%

Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

Ghisellini

Ghirlanda

Mereghetti

et al. 2006

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…[2] ascribed these bumps to the Compton scattering of the prompt gamma-ray photons on the circumburst material surrounding the burst progenitor. [2] assumed a shell of material with uniform density n and thickness R 0 located at distance R 0 from the central engine, which implies an optical depth to Compton scattering τ ∼ σ nR. Because of the Compton scattering the prompt gamma-ray photons are attenuated by a factor e −τ , and the resulting synchrotron flux is L s ∼ (n p e −τ )/(πθ 2 j t grb ), where n p is the number of gamma-ray photons, θ j is the burst jet aperture, and t grb is the burst duration.…”

Section: Motivation For An Alternative Grb Emission Mechanismmentioning

confidence: 99%

“…2 and the empirical relation implied by the Compton tail of the prompt emission, i.e. τR = σ T n 0 R 2 0 = const [2] to express the model parameters R 0 , n 0 and θ j in terms of only the measured quantities α p and T pro . This permit us to write GRB peak energy E p and its isotropic energy E iso in terms of only observed quantities (see [5] for details):…”

Section: Prediction: Grb Light Curves and Spectral-total Energy Corrementioning

confidence: 99%

Relativistic interaction of a high intensity photon beam with a plasma: a possible GRB emission mechanism

Barbiellini

Galli

Amati

et al. 2007

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

A long duration photon beam can induce macroscopic coherent effects on a plasma by single photon electron scattering if the probability of the interaction approaches 1 in a volume of unit surface and length equal to the plasma typical wavelength and the induced electron oscillations become relativistic in few plasma cycles. A fraction of the plasma electrons is accelerated through the Wakefield mechanism by the cavities created by the photon-electron interactions and radiates through boosted betraton emission in the same cavities. The resulting emission in this framework is very similar to the typical GRB radiation. Several comparisons with GRB light curves and spectral-energy correlations will be presented.

show abstract

“…In the astrophysical context of particle acceleration in GRBs, wakefield acceleration has been studied in the coherent regime where the forcing of the plasma is done by the electromagnetic field (Hoshino 2008;Liang & Noguchi 2007). Incoherent-or stochastic-wakefield processes have to our knowledge so far not been studied numerically, and have been considered theoretically only in a few cases (e.g., Barbiellini et al 2004Barbiellini et al , 2006.…”

Section: Introductionmentioning

confidence: 98%

Stochastically Induced Gamma-Ray Burst Wakefield Processes

Frederiksen

2008

ApJ

View full text Add to dashboard Cite

We present a numerical study of Gamma-Ray Burst - Circumburst Medium interaction and plasma preconditioning via Compton scattering. The simulation tool employed is a unique hybrid model; it combines a highly parallelized (Vlasov) particle-in-cell approach with continuous weighting of particles and a sub-Debye Monte-Carlo binary particle interaction framework. These first results from 3D simulations with this new simulation tool, the PhotonPlasma code, suggests that magnetic fields and plasma density filaments are created in the wakefield of prompt gamma-ray bursts, and that the photon flux density gradient has a significant impact on particle acceleration in the burst head and wakefield. We discuss some possible implications of the circumburst medium preconditioning for the trailing afterglow, and also discuss which additional processes will be needed to improve future studies within this unique and powerful simulation framework.Comment: 4 pages, 4 figures, accepted by Astrophyiscal Journal Letters. Rev.2: corrected figure colorbar units, shortened discussion, added references -- conclusions unchange

show abstract

Compton tails in long-duration gamma-ray bursts

Cited by 7 publications

References 21 publications

Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

Relativistic interaction of a high intensity photon beam with a plasma: a possible GRB emission mechanism

Stochastically Induced Gamma-Ray Burst Wakefield Processes

Contact Info

Product

Resources

About